SELECT 
  ec_holidays, 
  ec_time 
FROM 
  cscart_shippings 
WHERE 
  shipping_id = 96

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.00"
    },
    "table": {
      "table_name": "cscart_shippings",
      "access_type": "const",
      "possible_keys": [
        "shipping_id"
      ],
      "key": "shipping_id",
      "used_key_parts": [
        "shipping_id"
      ],
      "key_length": "3",
      "ref": [
        "const"
      ],
      "rows_examined_per_scan": 1,
      "rows_produced_per_join": 1,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "0.00",
        "eval_cost": "0.10",
        "prefix_cost": "0.00",
        "data_read_per_join": "2K"
      },
      "used_columns": [
        "shipping_id",
        "ec_holidays",
        "ec_time"
      ]
    }
  }
}

Result

ec_holidays ec_time
a:0:{} a:11:{i:1;a:4:{s:8:"day_code";s:1:"0";s:5:"start";s:5:"00:00";s:3:"end";s:5:"12:00";s:4:"days";s:1:"1";}i:2;a:4:{s:8:"day_code";s:1:"0";s:5:"start";s:5:"12:01";s:3:"end";s:5:"23:59";s:4:"days";s:1:"2";}i:3;a:4:{s:8:"day_code";s:1:"1";s:5:"start";s:5:"00:00";s:3:"end";s:5:"12:00";s:4:"days";s:1:"1";}i:4;a:4:{s:8:"day_code";s:1:"1";s:5:"start";s:5:"12:01";s:3:"end";s:5:"23:59";s:4:"days";s:1:"2";}i:5;a:4:{s:8:"day_code";s:1:"2";s:5:"start";s:5:"00:00";s:3:"end";s:5:"12:00";s:4:"days";s:1:"1";}i:6;a:4:{s:8:"day_code";s:1:"2";s:5:"start";s:5:"12:01";s:3:"end";s:5:"23:59";s:4:"days";s:1:"2";}i:7;a:4:{s:8:"day_code";s:1:"3";s:5:"start";s:5:"00:00";s:3:"end";s:5:"12:00";s:4:"days";s:1:"1";}i:8;a:4:{s:8:"day_code";s:1:"3";s:5:"start";s:5:"12:01";s:3:"end";s:5:"23:59";s:4:"days";s:1:"3";}i:9;a:4:{s:8:"day_code";s:1:"4";s:5:"start";s:5:"00:00";s:3:"end";s:5:"00:00";s:4:"days";s:1:"3";}i:10;a:4:{s:8:"day_code";s:1:"5";s:5:"start";s:5:"00:00";s:3:"end";s:5:"00:00";s:4:"days";s:1:"3";}i:11;a:4:{s:8:"day_code";s:1:"6";s:5:"start";s:5:"00:00";s:3:"end";s:5:"00:00";s:4:"days";s:1:"2";}}