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 (
    92257, 92496, 92497, 92498, 92499, 91296, 
    83101, 84107, 83999, 84001, 84003, 
    84005, 92051, 92052, 92053, 92054, 
    92055, 92056, 92057, 91550, 91619, 
    91788, 91789, 91790, 91791, 91792, 
    91793, 91794, 91795, 92254
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00038

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 (92257,92496,92497,92498,92499,91296,83101,84107,83999,84001,84003,84005,92051,92052,92053,92054,92055,92056,92057,91550,91619,91788,91789,91790,91791,91792,91793,91794,91795,92254)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
83101 nuie Arvan Freestanding Bath Shower Mixer - Chrome
83999 Old London Black Topaz With Lever Handle Wall Mounted Bath Filler - Chrome
84001 Old London Black Topaz With Crosshead Handle Wall Mounted Bath Filler - Chrome
84003 Old London Black Topaz With Lever Handle Wall Mounted Bath Filler - Chrome
84005 Old London Black Topaz With Crosshead Handle Wall Mounted Bath Filler - Chrome
84107 nuie Binsey Freestanding Bath Shower Mixer - Chrome
91296 nuie Aztec Floor Standing Bath Shower Mixer with Kit - Chrome
91550 BC Designs Kurv Plinth for Kurv Bath - White Only - White
91619 BC Designs Senator White Bun Feet For Senator Bath - Gloss White
91788 BC Designs Bun Feet For Senator Bath - Powder Blue
91789 BC Designs Bun Feet For Senator Bath - Light Fawn
91790 BC Designs Bun Feet For Senator Bath - Gun Metal
91791 BC Designs Bun Feet For Senator Bath - Industrial Grey
91792 BC Designs Bun Feet For Senator Bath - Khaki Green
91793 BC Designs Bun Feet For Senator Bath - Mushroom
91794 BC Designs Bun Feet For Senator Bath - Powder Grey
91795 BC Designs Bun Feet For Senator Bath - Satin Rose
92051 BC Designs Victrion Wall Mount Crosshead 3 Tap Hole Bath Filler Tap - Brushed Chrome
92052 BC Designs Victrion Wall Mount Crosshead 3 Tap Hole Bath Filler Tap - Brushed Copper
92053 BC Designs Victrion Wall Mount Crosshead 3 Tap Hole Bath Filler Tap - Brushed Gold
92054 BC Designs Victrion Wall Mount Crosshead 3 Tap Hole Bath Filler Tap - Brushed Nickel
92055 BC Designs Victrion Wall Mount Crosshead 3 Tap Hole Bath Filler Tap - Copper
92056 BC Designs Victrion Wall Mount Crosshead 3 Tap Hole Bath Filler Tap - Gold
92057 BC Designs Victrion Wall Mount Crosshead 3 Tap Hole Bath Filler Tap - Nickel
92254 BC Designs Bath Wastes Overflow Filler & Push Down Waste - Chrome
92257 BC Designs Bath Wastes Overflow Filler & Push Down Waste - Nickel
92496 BC Designs Overflow Filler & Push Down Waste - Brushed Chrome
92497 BC Designs Overflow Filler & Push Down Waste - Brushed Copper
92498 BC Designs Overflow Filler & Push Down Waste - Brushed Gold
92499 BC Designs Overflow Filler & Push Down Waste - Brushed Nickel