SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    514, 1505, 1506, 1507, 1508, 1509, 1510, 
    1511, 1512, 1513, 1514, 1515, 1516, 
    1526, 1527, 1528, 1529, 1530, 1531, 
    1532, 1533, 1534, 1535, 1536, 3675, 
    3727, 3728, 3730, 3731, 5210, 5211, 
    5212, 5213, 5214, 5215, 5216, 5217, 
    5218, 5219, 5228, 5229, 5230, 5231, 
    5232, 5233, 5234, 5235, 5236, 7496, 
    7497, 7500, 7501, 7506, 7507, 7528, 
    7529
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00119

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "67.44"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 56,
      "rows_produced_per_join": 56,
      "filtered": "100.00",
      "index_condition": "((`gaseus`.`cscart_product_descriptions`.`product_id` in (514,1505,1506,1507,1508,1509,1510,1511,1512,1513,1514,1515,1516,1526,1527,1528,1529,1530,1531,1532,1533,1534,1535,1536,3675,3727,3728,3730,3731,5210,5211,5212,5213,5214,5215,5216,5217,5218,5219,5228,5229,5230,5231,5232,5233,5234,5235,5236,7496,7497,7500,7501,7506,7507,7528,7529)) and (`gaseus`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "61.84",
        "eval_cost": "5.60",
        "prefix_cost": "67.44",
        "data_read_per_join": "255K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text",
        "unit_name"
      ]
    }
  }
}