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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    97524, 97534, 97535, 97536, 97537, 97538, 
    97539, 97540, 97541, 97542, 97543, 
    97544, 97545, 97546, 97547, 97548, 
    97549, 97550, 97551, 97552, 97553, 
    97554, 97555, 97556, 97557, 97558, 
    97559, 97560, 97561, 97562, 97563, 
    97564, 97565, 97566, 97568, 97569, 
    97571, 97572, 97587, 97588, 97589, 
    97590, 97591, 97592, 97593, 97594, 
    97595, 97596
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00113

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (97524,97534,97535,97536,97537,97538,97539,97540,97541,97542,97543,97544,97545,97546,97547,97548,97549,97550,97551,97552,97553,97554,97555,97556,97557,97558,97559,97560,97561,97562,97563,97564,97565,97566,97568,97569,97571,97572,97587,97588,97589,97590,97591,97592,97593,97594,97595,97596)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}