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 (
    91283, 83144, 90121, 84123, 89200, 83143, 
    84122, 82447, 91284, 91920, 91928, 
    91912, 90096, 90118, 89193, 89197, 
    83140, 84119, 83118, 84115, 86815, 
    89973, 82364, 82363, 90116, 89195, 
    89975, 84117, 83138, 90123
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00082

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 (91283,83144,90121,84123,89200,83143,84122,82447,91284,91920,91928,91912,90096,90118,89193,89197,83140,84119,83118,84115,86815,89973,82364,82363,90116,89195,89975,84117,83138,90123)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82363 nuie Round Showers Concealed Or Exposed Shower Valve - Chrome
82364 nuie Edwardian Manual Shower Valve - Chrome
82447 nuie Traditional Twin Exposed Shower Valve - Chrome/ White
83118 nuie Arvan Thermostatic Bar Valve - Chrome
83138 nuie Arvan Manual Shower Valve With Diverter - Chrome
83140 nuie Arvan Thermostatic Temperature Control Valve - Chrome
83143 nuie Arvan Twin Thermostatic Valve - Chrome
83144 nuie Arvan Twin Thermostatic Valve With Diverter - Chrome
84115 nuie Binsey Thermostatic Bar Valve - Chrome
84117 nuie Binsey Manual Shower Valve With Diverter - Chrome
84119 nuie Binsey Thermostatic Temperature Control Valve - Chrome
84122 nuie Binsey Twin Thermostatic Valve - Chrome
84123 nuie Binsey Twin Thermostatic Valve With Diverter - Chrome
86815 nuie Bar Showers Thermostatic Bar Valve - Chrome
89193 nuie Sanford Thermostatic Bar Valve - Chrome
89195 nuie Sanford Manual Shower Valve With Diverter - Chrome
89197 nuie Sanford Thermostatic Temperature Control Valve - Chrome
89200 nuie Sanford Twin Thermostatic Valve - Chrome
89973 nuie Bar Showers Minimalist Thermostatic Bar Valve - Chrome
89975 nuie Bar Showers Vertical Thermostatic Bar Valve - Chrome
90096 nuie Windon Thermostatic Bar Valve - Chrome
90116 nuie Windon Manual Shower Valve With Diverter - Chrome
90118 nuie Windon Thermostatic Temperature Control Valve - Chrome
90121 nuie Windon Twin Thermostatic Valve - Chrome
90123 nuie Windon Concealed Diverter 2/3/4 Way - Chrome
91283 nuie Aztec Twin Thermostatic Concealed Shower Valve with Diverter - 2 Outlet - Chrome
91284 nuie Aztec Twin Thermostatic Concealed Shower Valve - 1 Outlet - Chrome
91912 BC Designs Victrion Single Outlet Twin Thermostatic Concealed Shower Valve - Chrome
91920 BC Designs Victrion Single Outlet Twin Thermostatic Exposed Valve - Chrome
91928 BC Designs Victrion Two Outlet Triple Thermostatic Concealed Valve - Chrome