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 (
    97796, 97797, 97798, 98052, 98053, 98149, 
    98150, 98153, 98156, 98762, 98851, 
    98852, 98853, 98854, 98855, 98856, 
    98857, 98858, 99133, 99141, 99142, 
    99151, 99152, 99169, 99170, 99248, 
    99257, 99262, 99322, 99323, 99404, 
    99405, 99406, 99407, 99408, 99409, 
    99410, 99411, 100143, 100392, 100433, 
    100436, 100437, 100677, 100678, 100679, 
    100680, 100681
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00094

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 (97796,97797,97798,98052,98053,98149,98150,98153,98156,98762,98851,98852,98853,98854,98855,98856,98857,98858,99133,99141,99142,99151,99152,99169,99170,99248,99257,99262,99322,99323,99404,99405,99406,99407,99408,99409,99410,99411,100143,100392,100433,100436,100437,100677,100678,100679,100680,100681)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}