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 (
    86855, 84265, 89384, 89389, 89300, 89432, 
    89731, 89439, 82381, 89301, 82396, 
    86851, 89440, 82416, 86853, 89431, 
    89299, 84263, 84267, 89349, 89334, 
    83088, 89124, 89128, 89160, 89551, 
    82343, 89350, 89263, 89340, 82450, 
    82451, 86238, 91290, 84264, 91913, 
    91914, 91915, 91916, 91917, 91918, 
    91919, 82332, 86814, 86844, 89101, 
    89336, 89729
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00103

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 (86855,84265,89384,89389,89300,89432,89731,89439,82381,89301,82396,86851,89440,82416,86853,89431,89299,84263,84267,89349,89334,83088,89124,89128,89160,89551,82343,89350,89263,89340,82450,82451,86238,91290,84264,91913,91914,91915,91916,91917,91918,91919,82332,86814,86844,89101,89336,89729)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}