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 (
    82923, 82996, 83512, 83520, 83596, 83597, 
    83598, 83599, 85361, 86180, 86182, 
    86203, 86205, 86504, 86506, 86780, 
    86782, 89822, 89823, 89874, 89875, 
    89946, 89947, 91512, 91513, 86177, 
    86200, 86501, 86777, 86178
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00084

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 (82923,82996,83512,83520,83596,83597,83598,83599,85361,86180,86182,86203,86205,86504,86506,86780,86782,89822,89823,89874,89875,89946,89947,91512,91513,86177,86200,86501,86777,86178)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82923 nuie Arno 800mm Wall Hung 2-Drawer Vanity & Mid-Edge Basin - Anthracite
82996 nuie Arno 800mm Wall Hung 2-Drawer Vanity & Mid-Edge Basin - Charcoal Black
83512 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 800mm - Anthracite Woodgrain
83520 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 800mm - Hacienda Black
83596 nuie Athena Wall Hung 1 Drawer Vanity with Ceramic Mid-Edge Basin and Handle 600mm - Gloss Grey/Matt Black
83597 nuie Athena Wall Hung 1 Drawer Vanity with Ceramic Mid-Edge Basin and Handle 600mm - Gloss Grey/Brushed Brass
83598 nuie Athena Wall Hung 1 Drawer Vanity with Ceramic Mid-Edge Basin and Handle 600mm - Gloss Grey/Matt Black
83599 nuie Athena Wall Hung 1 Drawer Vanity with Ceramic Mid-Edge Basin and Handle 600mm - Gloss Grey/Chrome
85361 nuie Deco 800mm Wall Hung 2-Drawer Vanity & Mid-Edge Basin - Satin White
86177 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Mid-Edge Ceramic Basin, 600mm - Metallic Slate
86178 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Minimalist Ceramic Basin, 600mm - Metallic Slate
86180 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Thin-Edge Ceramic Basin, 600mm - Metallic Slate
86182 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Curved Ceramic Basin, 600mm - Metallic Slate
86200 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Mid-Edge Ceramic Basin, 600mm - Autumn Oak
86203 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Thin-Edge Ceramic Basin, 600mm - Autumn Oak
86205 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Curved Ceramic Basin, 600mm - Autumn Oak
86501 Hudson Reed Juno 600mm Wall Hung 2-Drawer Vanity & Mid-Edge 1 Tap Hole Basin - Autumn Oak
86504 Hudson Reed Juno 600mm Wall Hung 2-Drawer Vanity & Thin-Edge 1 Tap Hole Basin - Autumn Oak
86506 Hudson Reed Juno 600mm Wall Hung 2-Drawer Vanity & Curved 1 Tap Hole Basin - Autumn Oak
86777 Hudson Reed Juno Wall Hung 2 Drawer Vanity Basin Unit & Mid-Edge Ceramic Basin, 600mm - Metallic Slate
86780 Hudson Reed Juno Wall Hung 2 Drawer Vanity Basin Unit & Thin-Edge Ceramic Basin, 600mm - Metallic Slate
86782 Hudson Reed Juno Wall Hung 2 Drawer Vanity Basin Unit & Curved Ceramic Basin, 600mm - Metallic Slate
89822 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Thin-Edge Basin 800mm - Satin Grey
89823 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Curved Basin 800mm - Satin Grey
89874 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Thin-Edge Basin 800mm - Satin Blue
89875 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Curved Basin 800mm - Satin Blue
89946 Hudson Reed Urban 800mm Wall Hung 2-Drawer Unit and Thin-Edge Basin 1 Tap Hole - Satin Green
89947 Hudson Reed Urban 800mm Wall Hung 2-Drawer Unit and Curved Basin 1 Tap Hole - Satin Green
91512 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Thin-Edge Ceramic Basin, 800mm - Satin Anthracite
91513 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Curved Ceramic Basin, 800mm - Satin Anthracite