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 (
    85191, 85237, 82831, 82904, 82977, 83391, 
    83401, 89808, 89810, 89860, 89862, 
    89932, 89934, 91498, 91500, 86129, 
    86130, 86152, 86153, 85099, 85296, 
    85298, 85393, 85395
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00062

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 (85191,85237,82831,82904,82977,83391,83401,89808,89810,89860,89862,89932,89934,91498,91500,86129,86130,86152,86153,85099,85296,85298,85393,85395)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82831 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Mid-Edge Basin - Solace Oak
82904 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Mid-Edge Basin - Anthracite
82977 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Mid-Edge Basin - Charcoal Black
83391 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 600mm - Anthracite Woodgrain
83401 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 600mm - Hacienda Black
85099 Hudson Reed Fluted 500mm Wall Hung 2-Drawer Vanity and Thin-Edge Basin - Satin White
85191 Hudson Reed Fluted 500mm Wall Hung 2-Drawer Vanity and Thin-Edge Basin - Satin Blue
85237 Hudson Reed Fluted 500mm Wall Hung 2-Drawer Vanity and Thin-Edge Basin - Satin Green
85296 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Thin-Edge Basin - Satin Anthracite
85298 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Curved Basin - Satin Anthracite
85393 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Thin-Edge Basin - Satin Grey
85395 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Curved Basin - Satin Grey
86129 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Thin-Edge Ceramic Basin, 500mm - Graphite Grey
86130 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Curved Ceramic Basin, 500mm - Graphite Grey
86152 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Thin-Edge Ceramic Basin, 500mm - Coastal Grey
86153 Hudson Reed Havana Wall Hung 2 Drawer Vanity Basin Unit & Curved Ceramic Basin, 500mm - Coastal Grey
89808 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Thin-Edge Basin 600mm - Satin Grey
89810 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Curved Basin 600mm - Satin Grey
89860 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Thin-Edge Basin 600mm - Satin Blue
89862 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Curved Basin 600mm - Satin Blue
89932 Hudson Reed Urban 600mm Wall Hung 2-Drawer Unit and Thin-Edge Basin 1 Tap Hole - Satin Green
89934 Hudson Reed Urban 600mm Wall Hung 2-Drawer Unit and Curved Basin 1 Tap Hole - Satin Green
91498 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Thin-Edge Ceramic Basin, 600mm - Satin Anthracite
91500 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Curved Ceramic Basin, 600mm - Satin Anthracite