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 (
    90113, 91288, 83116, 83126, 83135, 90121, 
    89200, 83143, 84122, 82447, 91284, 
    91920, 91912, 90118, 89197, 83140, 
    84119, 82364, 82363, 90117, 89196, 
    90115, 89194, 84116, 84118, 83137, 
    82390, 92842, 94078, 94686
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00078

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 (90113,91288,83116,83126,83135,90121,89200,83143,84122,82447,91284,91920,91912,90118,89197,83140,84119,82364,82363,90117,89196,90115,89194,84116,84118,83137,82390,92842,94078,94686)) 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
82390 nuie Commercial Exposed Non-Concussive Valve - Chrome
82447 nuie Traditional Twin Exposed Shower Valve - Chrome/ White
83116 nuie Arvan Twin Thermostatic Valve - Matt Black
83126 nuie Arvan Twin Thermostatic Valve - Gunmetal
83135 nuie Arvan Twin Thermostatic Valve - Brushed Brass
83137 nuie Arvan Manual Shower Valve - Chrome
83140 nuie Arvan Thermostatic Temperature Control Valve - Chrome
83143 nuie Arvan Twin Thermostatic Valve - Chrome
84116 nuie Binsey Manual Shower Valve - Chrome
84118 nuie Binsey Concealed Stop Tap - Chrome
84119 nuie Binsey Thermostatic Temperature Control Valve - Chrome
84122 nuie Binsey Twin Thermostatic Valve - Chrome
89194 nuie Sanford Manual Shower Valve - Chrome
89196 nuie Sanford Concealed Stop Tap - Chrome
89197 nuie Sanford Thermostatic Temperature Control Valve - Chrome
89200 nuie Sanford Twin Thermostatic Valve - Chrome
90113 nuie Windon Twin Thermostatic Valve - Brushed Brass
90115 nuie Windon Manual Shower Valve - Chrome
90117 nuie Windon Concealed Stop Tap - Chrome
90118 nuie Windon Thermostatic Temperature Control Valve - Chrome
90121 nuie Windon Twin Thermostatic Valve - Chrome
91284 nuie Aztec Twin Thermostatic Concealed Shower Valve - 1 Outlet - Chrome
91288 nuie Aztec Twin Thermostatic Concealed Shower Valve - 1 Outlet - Matt Black
91912 BC Designs Victrion Single Outlet Twin Thermostatic Concealed Shower Valve - Chrome
91920 BC Designs Victrion Single Outlet Twin Thermostatic Exposed Valve - Chrome
92842
94078
94686