SELECT 
  * 
FROM 
  cscart_ec_extra_product_data 
WHERE 
  product_id IN (
    18, 16, 4, 5, 349, 350, 428, 23, 24, 1, 450, 
    451, 452, 453, 454, 455, 22, 25, 6, 8, 
    14, 9, 10, 19, 21
  )

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "4.70"
    },
    "table": {
      "table_name": "cscart_ec_extra_product_data",
      "access_type": "ALL",
      "rows_examined_per_scan": 13,
      "rows_produced_per_join": 6,
      "filtered": "50.00",
      "cost_info": {
        "read_cost": "3.40",
        "eval_cost": "1.30",
        "prefix_cost": "4.70",
        "data_read_per_join": "260"
      },
      "used_columns": [
        "product_id",
        "maximum_adults",
        "maximum_children",
        "maximum_room_occupancy",
        "minimum_length_of_stay",
        "maximum_length_of_stay",
        "company_id",
        "blocked_date"
      ],
      "attached_condition": "(`pankajecarter_systemfour`.`cscart_ec_extra_product_data`.`product_id` in (18,16,4,5,349,350,428,23,24,1,450,451,452,453,454,455,22,25,6,8,14,9,10,19,21))"
    }
  }
}