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 (
    82963, 83336, 83337, 83346, 83347, 86488, 
    86764, 83548, 85078, 85164, 85210, 
    85256, 86623, 86692, 82597, 82598, 
    83037, 83045, 83360, 83361, 83594, 
    90873, 90881, 90952
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00087

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "10.82"
    },
    "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": "8.42",
        "eval_cost": "2.40",
        "prefix_cost": "10.82",
        "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 (82963,83336,83337,83346,83347,86488,86764,83548,85078,85164,85210,85256,86623,86692,82597,82598,83037,83045,83360,83361,83594,90873,90881,90952)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82597 nuie Arno 600mm Wall Hung 1-Drawer Vanity & Laminate Top - Gloss White
82598 nuie Arno 600mm Wall Hung 1-Drawer Vanity & Laminate Top - Gloss White
82963 nuie Arno 600mm Wall Hung 1-Drawer Vanity & Laminate Top - Charcoal Black
83037 nuie Arno 600mm Wall Hung 1-Drawer Vanity & Worktop - Satin Green
83045 nuie Arno 600mm Wall Hung 2-Door Vanity & Laminate Top - Satin Green
83336 nuie Athena Wall Hung Single Drawer Vanity With Sparkling Black Worktop 600mm - Anthracite Woodgrain
83337 nuie Athena Wall Hung Single Drawer Vanity With Sparkling White Worktop 600mm - Anthracite Woodgrain
83346 nuie Athena Wall Hung Single Drawer Vanity With Sparkling Black Worktop 600mm - Hacienda Black
83347 nuie Athena Wall Hung Single Drawer Vanity With Sparkling White Worktop 600mm - Hacienda Black
83360 nuie Athena Wall Hung Single Drawer Vanity With Sparkling Black Worktop 600mm - Gloss White
83361 nuie Athena Wall Hung Single Drawer Vanity With Sparkling White Worktop 600mm - Gloss White
83548 nuie Athena Floor Standing 2 Door Vanity With Worktop 500mm - Gloss Grey
83594 nuie Athena Wall Hung Single Drawer Vanity With Worktop 600mm - Gloss Grey
85078 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Worktop - Satin Anthracite
85164 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Worktop - Satin Grey
85210 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Worktop - Satin Blue
85256 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Worktop - Satin Green
86488 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Worktop - Autumn Oak
86623 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Graphite Grey
86692 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Coastal Grey
86764 Hudson Reed Juno Wall Hung 1 Drawer Vanity Unit & Colour Match Worktop, 600mm - Metallic Slate
90873 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 600mm - Satin Anthracite
90881 nuie Arno Wall Hung 2 Door Vanity & Laminate Worktop, 600mm - Satin Anthracite/Bellato Grey
90952 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 600mm - Satin Grey