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 (
    85386, 85387, 85437, 85438, 85488, 85489, 
    89746, 89747, 86650, 86719, 84818, 
    84819, 91155, 82844, 82845, 82917, 
    82918, 82990, 82991, 83474, 83475, 
    83482, 83483, 85335, 85336, 85324, 
    85421, 85472, 85523, 83062, 83615, 
    90898, 90977, 89744, 89745, 85370, 
    83228, 83229, 83230, 83231, 82842, 
    82915, 82988, 83472, 83480, 87312, 
    87313, 87324
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00101

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 (85386,85387,85437,85438,85488,85489,89746,89747,86650,86719,84818,84819,91155,82844,82845,82917,82918,82990,82991,83474,83475,83482,83483,85335,85336,85324,85421,85472,85523,83062,83615,90898,90977,89744,89745,85370,83228,83229,83230,83231,82842,82915,82988,83472,83480,87312,87313,87324)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}