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 (
    87833, 87846, 87838, 88308, 88313, 88320, 
    88322, 87856, 87836, 87854, 87834, 
    87852, 92318, 88254, 92319, 92321, 
    92320, 88259, 88256, 88257, 85630, 
    88258, 87872, 92317, 88317, 88318, 
    88011, 88255, 88252, 88061, 92316, 
    87871, 88012, 88309, 88310, 91432, 
    88307, 88253, 88319, 88321, 85639, 
    88010, 88251, 88306, 88312, 85640, 
    88311, 92892
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00036

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 (87833,87846,87838,88308,88313,88320,88322,87856,87836,87854,87834,87852,92318,88254,92319,92321,92320,88259,88256,88257,85630,88258,87872,92317,88317,88318,88011,88255,88252,88061,92316,87871,88012,88309,88310,91432,88307,88253,88319,88321,85639,88010,88251,88306,88312,85640,88311,92892)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}