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 (
    99296, 99297, 99298, 99299, 99300, 99301, 
    99302, 99303, 99304, 99305, 99306, 
    99307, 99308, 99309, 99310, 99311, 
    99312, 100400, 100401, 100402, 100403, 
    100404, 100405, 100406, 100407, 100408, 
    100409, 100410, 100411, 100412, 100417, 
    100418, 100419, 100420, 100421, 100422, 
    100423, 100424, 100425, 100426, 100427, 
    101055, 101056, 101057, 101058, 101059, 
    101060, 101061, 101062, 101063, 101064, 
    101065, 101066, 101067, 101068, 101069, 
    101070, 101071, 101072, 101073, 101074, 
    101075, 101076, 101077, 101078, 101079, 
    101080, 101081, 101082, 101083, 101084, 
    101085, 101086, 101087, 101088, 101089, 
    101090, 101091, 101092
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00133

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "35.59"
    },
    "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": 79,
      "rows_produced_per_join": 79,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "27.69",
        "eval_cost": "7.90",
        "prefix_cost": "35.59",
        "data_read_per_join": "301K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (99296,99297,99298,99299,99300,99301,99302,99303,99304,99305,99306,99307,99308,99309,99310,99311,99312,100400,100401,100402,100403,100404,100405,100406,100407,100408,100409,100410,100411,100412,100417,100418,100419,100420,100421,100422,100423,100424,100425,100426,100427,101055,101056,101057,101058,101059,101060,101061,101062,101063,101064,101065,101066,101067,101068,101069,101070,101071,101072,101073,101074,101075,101076,101077,101078,101079,101080,101081,101082,101083,101084,101085,101086,101087,101088,101089,101090,101091,101092)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}