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 (
    95919, 95920, 95921, 95922, 95923, 95924, 
    95925, 95926, 95927, 95928, 95929, 
    95930, 95931, 95934, 95935, 95937, 
    95938, 95939, 95941, 95942, 95943, 
    95944, 95945, 95946, 96123, 96130, 
    96202, 96203, 96204, 96205, 96206, 
    96207, 96208, 96210, 96211, 96295, 
    96298, 96299, 96300, 96301, 96341, 
    96342, 96343, 96344, 96345, 96346, 
    96347, 96348
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00104

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "25.94"
    },
    "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": "21.14",
        "eval_cost": "4.80",
        "prefix_cost": "25.94",
        "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 (95919,95920,95921,95922,95923,95924,95925,95926,95927,95928,95929,95930,95931,95934,95935,95937,95938,95939,95941,95942,95943,95944,95945,95946,96123,96130,96202,96203,96204,96205,96206,96207,96208,96210,96211,96295,96298,96299,96300,96301,96341,96342,96343,96344,96345,96346,96347,96348)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}