SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  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 (
    3775, 3776, 3777, 1143, 1139, 1140, 1141, 
    1142, 3681, 3682, 3683, 3684, 3685, 
    4890, 2207, 2208, 2209, 2210, 2211, 
    2212, 2213, 2214, 2215, 2216, 5808, 
    5809, 5810, 5811, 5812, 5813, 5814, 
    5815, 5816, 1654, 1655, 1656, 1657, 
    1658, 1659, 1660, 1661, 1662, 1663, 
    1664, 1665, 1666, 1667, 1668, 1669, 
    1670, 1671, 2220, 2221, 2222, 2223, 
    5353, 5354, 5355, 5356, 5357, 5358, 
    5359, 5360, 5361, 5362, 5363, 5364, 
    5365, 5366, 5367, 5368, 5369, 5370, 
    5820, 5821, 5822, 5823, 5802
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00156

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "93.93"
    },
    "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": 78,
      "rows_produced_per_join": 78,
      "filtered": "100.00",
      "index_condition": "((`gaseus`.`cscart_product_descriptions`.`product_id` in (3775,3776,3777,1143,1139,1140,1141,1142,3681,3682,3683,3684,3685,4890,2207,2208,2209,2210,2211,2212,2213,2214,2215,2216,5808,5809,5810,5811,5812,5813,5814,5815,5816,1654,1655,1656,1657,1658,1659,1660,1661,1662,1663,1664,1665,1666,1667,1668,1669,1670,1671,2220,2221,2222,2223,5353,5354,5355,5356,5357,5358,5359,5360,5361,5362,5363,5364,5365,5366,5367,5368,5369,5370,5820,5821,5822,5823,5802)) and (`gaseus`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "86.13",
        "eval_cost": "7.80",
        "prefix_cost": "93.93",
        "data_read_per_join": "355K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text",
        "unit_name"
      ]
    }
  }
}