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 (
    87317, 87328, 87329, 87340, 87341, 85120, 
    87310, 87311, 87322, 87323, 87334, 
    87335, 87346, 87347, 84654, 84655, 
    89818, 89819, 89870, 89871, 89942, 
    89943, 91508, 91509, 83083, 83084, 
    83611, 83612, 86144, 86145, 86167, 
    86168, 86660, 86661, 86729, 86730, 
    90922, 90923, 91001, 91002, 87298, 
    87299, 87292, 87293, 84527, 84528, 
    84593, 84594
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00102

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.62"
    },
    "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": "16.82",
        "eval_cost": "4.80",
        "prefix_cost": "21.62",
        "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 (87317,87328,87329,87340,87341,85120,87310,87311,87322,87323,87334,87335,87346,87347,84654,84655,89818,89819,89870,89871,89942,89943,91508,91509,83083,83084,83611,83612,86144,86145,86167,86168,86660,86661,86729,86730,90922,90923,91001,91002,87298,87299,87292,87293,84527,84528,84593,84594)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}