SELECT 
  cscart_bm_snapping.grid_id as grid_id, 
  cscart_bm_snapping.block_id as block_id, 
  IFNULL(
    dynamic_object_content.content, 
    default_content.content
  ) as content, 
  IFNULL(
    dynamic_object_content.object_id, 
    default_content.object_id
  ) AS object_id, 
  IFNULL(
    dynamic_object_content.object_type, 
    default_content.object_type
  ) AS object_type, 
  cscart_bm_block_statuses.object_ids as object_ids, 
  cscart_bm_snapping.*, 
  cscart_bm_blocks.*, 
  cscart_bm_blocks_descriptions.* 
FROM 
  cscart_bm_snapping 
  LEFT JOIN cscart_bm_blocks ON cscart_bm_blocks.block_id = cscart_bm_snapping.block_id 
  LEFT JOIN cscart_bm_block_statuses ON cscart_bm_snapping.snapping_id = cscart_bm_block_statuses.snapping_id 
  AND cscart_bm_block_statuses.object_type LIKE 'categories' 
  LEFT JOIN cscart_bm_blocks_descriptions ON cscart_bm_blocks.block_id = cscart_bm_blocks_descriptions.block_id 
  LEFT JOIN cscart_bm_blocks_content AS default_content ON cscart_bm_blocks.block_id = default_content.block_id 
  AND cscart_bm_blocks_descriptions.lang_code = default_content.lang_code 
  AND default_content.snapping_id = 0 
  AND default_content.object_id = 0 
  AND default_content.object_type like '' 
  LEFT JOIN cscart_bm_blocks_content AS dynamic_object_content ON cscart_bm_blocks.block_id = dynamic_object_content.block_id 
  AND cscart_bm_blocks_descriptions.lang_code = dynamic_object_content.lang_code 
  AND dynamic_object_content.object_id = 396 
  AND dynamic_object_content.object_type like 'categories' 
WHERE 
  cscart_bm_snapping.grid_id IN (
    838, 839, 840, 841, 844, 842, 843, 847, 
    852, 848, 849, 850, 851, 853, 854, 906, 
    908, 907, 909, 910, 911
  ) 
  AND cscart_bm_blocks_descriptions.lang_code = 'pl' 
ORDER BY 
  cscart_bm_snapping.order, 
  cscart_bm_snapping.block_id

Query time 0.00102

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1186.86"
    },
    "ordering_operation": {
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "784.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_bm_snapping",
            "access_type": "range",
            "possible_keys": [
              "grid_id"
            ],
            "key": "grid_id",
            "used_key_parts": [
              "grid_id"
            ],
            "key_length": "4",
            "rows_examined_per_scan": 56,
            "rows_produced_per_join": 56,
            "filtered": "100.00",
            "index_condition": "(`cscartdevel`.`cscart_bm_snapping`.`grid_id` in (838,839,840,841,844,842,843,847,852,848,849,850,851,853,854,906,908,907,909,910,911))",
            "cost_info": {
              "read_cost": "24.86",
              "eval_cost": "5.60",
              "prefix_cost": "30.46",
              "data_read_per_join": "43K"
            },
            "used_columns": [
              "snapping_id",
              "block_id",
              "grid_id",
              "wrapper",
              "user_class",
              "order",
              "status"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_bm_block_statuses",
            "access_type": "ref",
            "possible_keys": [
              "snapping_id"
            ],
            "key": "snapping_id",
            "used_key_parts": [
              "snapping_id"
            ],
            "key_length": "4",
            "ref": [
              "cscartdevel.cscart_bm_snapping.snapping_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 56,
            "filtered": "100.00",
            "index_condition": "<if>(is_not_null_compl(cscart_bm_block_statuses), ((`cscartdevel`.`cscart_bm_snapping`.`snapping_id` = `cscartdevel`.`cscart_bm_block_statuses`.`snapping_id`) and (`cscartdevel`.`cscart_bm_block_statuses`.`object_type` like 'categories')), true)",
            "cost_info": {
              "read_cost": "14.00",
              "eval_cost": "5.60",
              "prefix_cost": "50.06",
              "data_read_per_join": "6K"
            },
            "used_columns": [
              "snapping_id",
              "object_ids",
              "object_type"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_bm_blocks",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "block_id"
            ],
            "key_length": "4",
            "ref": [
              "cscartdevel.cscart_bm_snapping.block_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 56,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "14.00",
              "eval_cost": "5.60",
              "prefix_cost": "69.66",
              "data_read_per_join": "12K"
            },
            "used_columns": [
              "block_id",
              "type",
              "properties",
              "company_id",
              "storefront_id"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_bm_blocks_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "block_id",
              "lang_code"
            ],
            "key_length": "10",
            "ref": [
              "cscartdevel.cscart_bm_snapping.block_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 56,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "14.00",
              "eval_cost": "5.60",
              "prefix_cost": "89.26",
              "data_read_per_join": "11K"
            },
            "used_columns": [
              "block_id",
              "lang_code",
              "name"
            ]
          }
        },
        {
          "table": {
            "table_name": "default_content",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "block_id",
              "snapping_id",
              "lang_code",
              "object_id"
            ],
            "key_length": "18",
            "ref": [
              "cscartdevel.cscart_bm_snapping.block_id",
              "const",
              "cscartdevel.cscart_bm_blocks_descriptions.lang_code",
              "const"
            ],
            "rows_examined_per_scan": 2,
            "rows_produced_per_join": 112,
            "filtered": "100.00",
            "index_condition": "<if>(is_not_null_compl(default_content), (`cscartdevel`.`default_content`.`object_type` like ''), true)",
            "cost_info": {
              "read_cost": "28.00",
              "eval_cost": "11.20",
              "prefix_cost": "128.46",
              "data_read_per_join": "24K"
            },
            "used_columns": [
              "snapping_id",
              "object_id",
              "object_type",
              "block_id",
              "lang_code",
              "content"
            ]
          }
        },
        {
          "table": {
            "table_name": "dynamic_object_content",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "block_id"
            ],
            "key_length": "4",
            "ref": [
              "cscartdevel.cscart_bm_snapping.block_id"
            ],
            "rows_examined_per_scan": 7,
            "rows_produced_per_join": 784,
            "filtered": "100.00",
            "index_condition": "<if>(is_not_null_compl(dynamic_object_content), ((`cscartdevel`.`dynamic_object_content`.`object_id` = 396) and (`cscartdevel`.`dynamic_object_content`.`lang_code` = `cscartdevel`.`cscart_bm_blocks_descriptions`.`lang_code`) and (`cscartdevel`.`dynamic_object_content`.`object_type` like 'categories')), true)",
            "cost_info": {
              "read_cost": "196.00",
              "eval_cost": "78.40",
              "prefix_cost": "402.86",
              "data_read_per_join": "171K"
            },
            "used_columns": [
              "object_id",
              "object_type",
              "block_id",
              "lang_code",
              "content"
            ]
          }
        }
      ]
    }
  }
}