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 (
    91627, 83923, 82422, 89379, 89394, 89396, 
    89343, 89385, 89375, 89376, 89381, 
    89289, 89390, 89392, 89344, 89382, 
    89388, 89380, 89395, 89397, 89410, 
    89411, 89412, 82423, 89341, 89290, 
    91945, 91946, 91947, 91948, 91949, 
    91950, 91951, 89360, 89286, 89387, 
    89342, 89363, 89377, 89365, 89359, 
    89288, 89386, 89383, 89297, 89362, 
    89364, 89378
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00115

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "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 (91627,83923,82422,89379,89394,89396,89343,89385,89375,89376,89381,89289,89390,89392,89344,89382,89388,89380,89395,89397,89410,89411,89412,82423,89341,89290,91945,91946,91947,91948,91949,91950,91951,89360,89286,89387,89342,89363,89377,89365,89359,89288,89386,89383,89297,89362,89364,89378)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82422 Hudson Reed Shower Kits Wall Mounted Thermostatic Shower Valve & Kit - Brushed Brass
82423 Hudson Reed Shower Kits Wall Mounted Thermostatic Shower Valve & Kit - Brushed Brass
83923 BC Designs Murali Square Back To Wall Bath 1720mm x 740mm - White
89286 nuie 2 Outlet Arvan Bundle With Stop Tap & Diverter - Chrome
89288 nuie 2 Outlet Arvan Double Bundle With Stop Taps - Chrome
89289 nuie 3 Outlet Arvan Bundle With Stop Taps - Chrome
89290 nuie 3 Outlet Arvan Bundle With Stop Tap & Diverter - Chrome
89297 nuie Thermostatic Concealed Triple Round Valve, Slide Rail Kit with Multi Function Handset & Outlet Elbow Wall Mount Shower Arm & Round Fixed Head Shower Kit - Chrome
89341 nuie 2 Outlet Windon Bundle With Stop Tap & Diverter - Chrome
89342 nuie 2 Outlet Windon Bundle With Stop Taps - Chrome
89343 nuie 3 Outlet Windon Bundle With Stop Taps - Chrome
89344 nuie 3 Outlet Bundle Windon With Stop Tap & Diverter - Chrome
89359 nuie Thermostatic Concealed Twin Square Valve with Single Function Handset & Outlet Elbow Wall Mount Shower Arm & Square Fixed Head Shower Kit - Chrome
89360 nuie Sanford Thermostatic Concealed Triple Square Valve with Single Function Handset & Outlet Elbow Wall Mount Shower Arm & Square Fixed Head Shower Kit - Chrome
89362 nuie Windon Thermostatic Concealed Twin Square Valve with Diverter with Single Function Handset & Outlet Elbow Wall Mount Shower Arm & Square Fixed Head Shower Kit - Chrome
89363 nuie Windon Thermostatic Concealed Triple Square Valve with Single Function Handset & Outlet Elbow Wall Mount Shower Arm & Square Fixed Head Shower Kit - Chrome
89364 nuie Sanford Thermostatic Concealed Twin Square Valve with Diverter with Single Function Handset & Outlet Elbow Wall Mount Shower Arm & Square Fixed Head Shower Kit - Chrome
89365 nuie Sanford Thermostatic Concealed Triple Square Valve with Single Function Handset & Outlet Elbow Wall Mount Shower Arm & Square Fixed Head Shower Kit - Chrome
89375 Hudson Reed Twin Exposed Valve & Rigid Riser Kit - Chrome
89376 Hudson Reed Twin Exposed Valve & Rigid Riser Kit - Chrome
89377 Hudson Reed Twin Exposed Valve & Rigid Riser Kit - Chrome
89378 Hudson Reed Twin Exposed Valve & Slide Rail Kit - Chrome
89379 Hudson Reed Triple Exposed Valve & Rigid Riser Kit - Chrome
89380 Hudson Reed Triple Exposed Valve & Rigid Riser Kit - Chrome
89381 Hudson Reed Dual Exposed Valve & Rigid Riser Kit - Chrome
89382 Hudson Reed Dual Exposed Valve & Rigid Riser Kit - Chrome
89383 Hudson Reed Dual Exposed Valve & Rigid Riser Kit - Chrome
89385 Hudson Reed Twin Exposed Valve & Rigid Riser Kit - Chrome
89386 Hudson Reed Twin Exposed Valve & Slide Rail Kit - Chrome
89387 Hudson Reed Twin Exposed Valve & Rigid Riser Kit - Chrome
89388 nuie Victorian Traditional Dual Exposed Valve & Rigid Riser Shower Kit - Chrome/White
89390 nuie Victorian Traditional Twin Exposed Valve & Rigid Riser Shower Kit - Chrome/White
89392 nuie Edwardian Traditional Twin Exposed Valve & Rigid Riser Shower Kit - Chrome/White
89394 nuie Victorian Traditional Triple Exposed Valve, Rigid Riser Kit & Bath Spout Shower Kit - Chrome/White
89395 nuie Victorian Traditional Triple Exposed Valve & Rigid Riser Kit Shower Kit - Chrome/White
89396 nuie Edwardian Traditional Triple Exposed Valve, Rigid Riser Kit & Bath Spout Shower Kit - Chrome/White
89397 nuie Edwardian Traditional Triple Exposed Valve & Rigid Riser Kit Shower Kit - Chrome/White
89410 nuie Victorian Traditional Thermostatic Concealed Triple Valve, Single Function Slider Rail Kit & Outlet Elbow & Wall Mount Shower Arm and Round Fixed Head Shower Kit - Chrome/White
89411 nuie Victorian Traditional Thermostatic Concealed Triple Valve, Single Function Slider Rail Kit & Outlet Elbow & Wall Mount Shower Arm and Round Fixed Head Shower Kit - Chrome/White
89412 nuie Edwardian Traditional Thermostatic Concealed Triple Valve, Single Function Slider Rail Kit & Outlet Elbow & Wall Mount Shower Arm and Round Fixed Head Shower Kit - Chrome/White
91627 BC Designs Aston Freestanding Bath - 1720mm - Polished White
91945 BC Designs Victrion Superbe Fixed Rigid Riser Kit with 8" Shower Head and Handset - Brushed Chrome
91946 BC Designs Victrion Superbe Fixed Rigid Riser Kit with 8" Shower Head and Handset - Brushed Copper
91947 BC Designs Victrion Superbe Fixed Rigid Riser Kit with 8" Shower Head and Handset - Brushed Gold
91948 BC Designs Victrion Superbe Fixed Rigid Riser Kit with 8" Shower Head and Handset - Brushed Nickel
91949 BC Designs Victrion Superbe Fixed Rigid Riser Kit with 8" Shower Head and Handset - Copper
91950 BC Designs Victrion Superbe Fixed Rigid Riser Kit with 8" Shower Head and Handset - Gold
91951 BC Designs Victrion Superbe Fixed Rigid Riser Kit with 8" Shower Head and Handset - Nickel