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 (
    83268, 83270, 90544, 90545, 91070, 91071, 
    91073, 91074, 91075, 90567, 90573, 
    90579, 87308, 87309, 87320, 87321, 
    87332, 87333, 87344, 87345, 90555, 
    90582, 90855, 90934
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00083

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "12.97"
    },
    "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": 24,
      "rows_produced_per_join": 24,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "10.57",
        "eval_cost": "2.40",
        "prefix_cost": "12.97",
        "data_read_per_join": "91K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (83268,83270,90544,90545,91070,91071,91073,91074,91075,90567,90573,90579,87308,87309,87320,87321,87332,87333,87344,87345,90555,90582,90855,90934)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
83268 nuie Athena Floor Standing 4 Door Vanity With Twin Polymarble Basin 1200mm - Gloss White
83270 nuie Athena Floor Standing 4 Door Vanity With Twin Ceramic Basin 1200mm - Gloss White
87308 nuie Lunar Floor Standing 2 Drawer Unit & Polymarble Basin, 800mm - Satin Anthracite
87309 nuie Lunar Floor Standing 2 Drawer Unit & Ceramic Basin, 800mm - Satin Anthracite
87320 nuie Lunar Floor Standing 2 Drawer Unit & Polymarble Basin, 800mm - Satin Grey
87321 nuie Lunar Floor Standing 2 Drawer Unit & Ceramic Basin, 800mm - Satin Grey
87332 nuie Lunar Floor Standing 2 Drawer Unit & Polymarble Basin, 800mm - Satin Blue
87333 nuie Lunar Floor Standing 2 Drawer Unit & Ceramic Basin, 800mm - Satin Blue
87344 nuie Lunar Floor Standing 2 Drawer Unit & Polymarble Basin, 800mm - Satin Green
87345 nuie Lunar Floor Standing 2 Drawer Unit & Ceramic Basin, 800mm - Satin Green
90544 Nuie Arno 1200mm Floor Standing 4 Door Vanity & Double Basin 1 - Gloss White
90545 Nuie Arno 1200mm Floor Standing 4 Door Vanity & Double Basin 2 - Gloss White
90555 Nuie Arno 1200mm Floor Standing 4 Drawer Vanity & Worktop - Gloss White
90567 Nuie Arno 1200mm Floor Standing 4 Drawer Vanity & Worktop - Grey Vicenza Oak
90573 Nuie Arno 1200mm Floor Standing 4 Drawer Vanity & Worktop - Anthracite Woodgrain
90579 Nuie Arno 1200mm Floor Standing 4 Drawer Vanity & Worktop - Black Woodgrain
90582 Nuie Arno 1200mm Floor Standing 4 Door Vanity & Worktop - Satin Green
90855 nuie Arno Floor Standing 4 Door Vanity & Laminate Worktop, 1200mm - Satin Anthracite
90934 nuie Arno Floor Standing 4 Door Vanity & Laminate Worktop, 1200mm - Satin Grey
91070 nuie Classique Floor Standing 2 Door Unit & 1 Tap Hole Marble Top with Oval Basin, 600mm - Satin White/Grey
91071 nuie Classique Floor Standing 2 Door Unit & 3 Tap Hole Marble Top with Oval Basin, 600mm - Satin White/Grey
91073 nuie Classique Floor Standing 2 Door Unit & 1 Tap Hole Marble Top with Oval Basin, 600mm - Satin White/White
91074 nuie Classique Floor Standing 2 Door Unit & 3 Tap Hole Marble Top with Oval Basin, 600mm - Satin White/White
91075 nuie Classique Floor Standing 2 Door Unit & 1 Tap Hole Marble Top with Square Basin, 600mm - Satin White/White