SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    1893, 1857, 2147, 1790, 1877, 1858, 1876, 
    1841, 1796, 2329, 2330, 1860, 2148, 
    2152, 1868, 1881, 1888, 2303, 2016, 
    2319, 1999, 2019, 2321, 2322, 2018, 
    1928, 2017, 1998, 2020, 2071, 2320, 
    2333, 2080, 2325, 2113, 2324, 2327, 
    2326, 2347, 2323, 2135, 2300, 2206, 
    2193, 2079, 2078, 1921, 2296, 2012, 
    2013, 2280, 2335, 2380, 2035, 1941, 
    2052, 2055, 1960, 1926, 1990, 2341, 
    2053, 1937, 2353, 2072, 2074, 2073, 
    2312, 2313, 2084, 2292, 2304, 1821, 
    2164, 1786, 1805, 1822, 2170, 2189, 
    2188
  )

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "2.33"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "f",
          "access_type": "ALL",
          "possible_keys": [
            "idx_group_id"
          ],
          "rows_examined_per_scan": 2,
          "rows_produced_per_join": 2,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.52",
            "eval_cost": "0.20",
            "prefix_cost": "0.72",
            "data_read_per_join": "208"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "cscartdevel.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 2,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.50",
            "eval_cost": "0.20",
            "prefix_cost": "1.42",
            "data_read_per_join": "800"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "ALL",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "rows_examined_per_scan": 2,
          "rows_produced_per_join": 4,
          "filtered": "100.00",
          "using_join_buffer": "hash join",
          "cost_info": {
            "read_cost": "0.51",
            "eval_cost": "0.40",
            "prefix_cost": "2.33",
            "data_read_per_join": "64"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ],
          "attached_condition": "((`cscartdevel`.`p`.`group_id` = `cscartdevel`.`f`.`group_id`) and (`cscartdevel`.`p`.`product_id` in (1893,1857,2147,1790,1877,1858,1876,1841,1796,2329,2330,1860,2148,2152,1868,1881,1888,2303,2016,2319,1999,2019,2321,2322,2018,1928,2017,1998,2020,2071,2320,2333,2080,2325,2113,2324,2327,2326,2347,2323,2135,2300,2206,2193,2079,2078,1921,2296,2012,2013,2280,2335,2380,2035,1941,2052,2055,1960,1926,1990,2341,2053,1937,2353,2072,2074,2073,2312,2313,2084,2292,2304,1821,2164,1786,1805,1822,2170,2189,2188)))"
        }
      }
    ]
  }
}