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 (
    86787, 83060, 90896, 90975, 85069, 85155, 
    85201, 85247, 85109, 86141, 86164, 
    86649, 86718, 89815, 89867, 89939, 
    91505, 82841, 82914, 82987, 85303, 
    85400, 85451, 85502
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00136

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 (86787,83060,90896,90975,85069,85155,85201,85247,85109,86141,86164,86649,86718,89815,89867,89939,91505,82841,82914,82987,85303,85400,85451,85502)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82841 nuie Arno 1200mm Wall Hung 4-Drawer Vanity & Worktop - Solace Oak
82914 nuie Arno 1200mm Wall Hung 4-Drawer Vanity & Worktop - Anthracite
82987 nuie Arno 1200mm Wall Hung 4-Drawer Vanity & Worktop - Charcoal Black
83060 nuie Arno 1200mm Wall Hung 4-Drawer Vanity & Worktop - Satin Green
85069 Hudson Reed Fluted 1200mm Wall Hung 4-Drawer Vanity and Worktop - Satin Anthracite
85109 Hudson Reed Fluted 1200mm Wall Hung 4-Drawer Vanity and Worktop - Satin White
85155 Hudson Reed Fluted 1200mm Wall Hung 4-Drawer Vanity and Worktop - Satin Grey
85201 Hudson Reed Fluted 1200mm Wall Hung 4-Drawer Vanity and Worktop - Satin Blue
85247 Hudson Reed Fluted 1200mm Wall Hung 4-Drawer Vanity and Worktop - Satin Green
85303 nuie Deco 1200mm Wall Hung 4-Drawer Vanity & Worktop - Satin Anthracite
85400 nuie Deco 1200mm Wall Hung 4-Drawer Vanity & Worktop - Satin Grey
85451 nuie Deco 1200mm Wall Hung 4-Drawer Vanity & Worktop - Satin Blue
85502 nuie Deco 1200mm Wall Hung 4-Drawer Vanity & Worktop - Satin Green
86141 Hudson Reed Havana Wall Hung 4 Drawer Unit & Colour Match Worktop, 1200mm - Graphite Grey
86164 Hudson Reed Havana Wall Hung 4 Drawer Unit & Colour Match Worktop, 1200mm - Coastal Grey
86649 Hudson Reed Juno 1200mm Wall Hung 4-Drawer Vanity & Worktop - Graphite Grey
86718 Hudson Reed Juno 1200mm Wall Hung 4-Drawer Vanity & Worktop - Coastal Grey
86787 Hudson Reed Juno Wall Hung 4 Drawer Vanity Unit & Colour Match Worktop, 1200mm - Metallic Slate
89815 Hudson Reed Urban 1200mm Wall Hung 4-Drawer Unit & Worktop - Satin Grey
89867 Hudson Reed Urban 1200mm Wall Hung 4-Drawer Unit & Worktop - Satin Blue
89939 Hudson Reed Urban 1200mm Wall Hung 4-Drawer Unit & Worktop - Satin Green
90896 nuie Arno Wall Hung 4 Drawer Vanity & Laminate Worktop, 1200mm - Satin Anthracite
90975 nuie Arno Wall Hung 4 Drawer Vanity & Laminate Worktop, 1200mm - Satin Grey
91505 Hudson Reed Urban Wall Hung 4 Drawer Vanity & Laminate Worktop, 1200mm - Satin Anthracite