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 (
    92424, 92425, 92426, 92427, 92428, 92429, 
    92431, 92432, 92433, 92434, 92435, 
    92436, 92437, 92438, 87252, 87253, 
    87254, 87255, 87256, 87257, 87258, 
    87259, 88102, 88103, 92430, 92439, 
    84775, 84779, 84788, 84797
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "13.52"
    },
    "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": 30,
      "rows_produced_per_join": 30,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "10.52",
        "eval_cost": "3.00",
        "prefix_cost": "13.52",
        "data_read_per_join": "114K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (92424,92425,92426,92427,92428,92429,92431,92432,92433,92434,92435,92436,92437,92438,87252,87253,87254,87255,87256,87257,87258,87259,88102,88103,92430,92439,84775,84779,84788,84797)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
84775 nuie Classique Soft Close Wooden Toilet Seat - Satin Anthracite
84779 nuie Classique Soft Close Wooden Toilet Seat - Satin White
84788 nuie Classique Soft Close Wooden Toilet Seat - Satin Grey
84797 nuie Classique Soft Close Wooden Toilet Seat - Satin Green
87252 Old London Chancery Top Fix Soft Close Toilet Seat - Storm Grey
87253 Old London Richmond Top Fix Soft Close Toilet Seat - Storm Grey
87254 Old London Chancery Top Fix Soft Close Toilet Seat - Twilight Blue
87255 Old London Richmond Top Fix Soft Close Toilet Seat - Twilight Blue
87256 Old London Chancery Top Fix Soft Close Toilet Seat - Timeless Sand
87257 Old London Richmond Top Fix Soft Close Toilet Seat - Timeless Sand
87258 Old London Chancery Ryther Toilet Seat - Hunter Green
87259 Old London Richmond Carlton Toilet Seat - Hunter Green
88102 Hudson Reed Toilet Seats Chancery Toilet Seat - White
88103 Hudson Reed Toilet Seats Richmond Toilet Seat - White
92424 BC Designs Victrion Black Matt Toilet - Soft Close Seat - Brushed Chrome
92425 BC Designs Victrion Black Matt Toilet - Soft Close Seat - Brushed Copper
92426 BC Designs Victrion Black Matt Toilet - Soft Close Seat - Brushed Gold
92427 BC Designs Victrion Black Matt Toilet - Soft Close Seat - Brushed Nickel
92428 BC Designs Victrion Black Matt Toilet - Soft Close Seat - Copper
92429 BC Designs Victrion Black Matt Toilet - Soft Close Seat - Gold
92430 BC Designs Victrion Matt Black Soft close Toilet Seat - Matt Black
92431 BC Designs Victrion Black Matt Toilet - Soft Close Seat - Nickel
92432 BC Designs Victrion White Matt Toilet - Soft Close Seat - Brushed Chrome
92433 BC Designs Victrion White Matt Toilet - Soft Close Seat - Brushed Copper
92434 BC Designs Victrion White Matt Toilet - Soft Close Seat - Brushed Gold
92435 BC Designs Victrion White Matt Toilet - Soft Close Seat - Brushed Nickel
92436 BC Designs Victrion White Matt Toilet - Soft Close Seat - Copper
92437 BC Designs Victrion White Matt Toilet - Soft Close Seat - Gold
92438 BC Designs Victrion White Matt Toilet - Soft Close Seat - Nickel
92439 BC Designs Victrion White Gloss Soft close Toilet Seat - Gloss White