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 (
    92511, 92518, 84047, 84277, 84282, 92514, 
    92549, 85010, 92542, 92543, 84273, 
    84275, 84955, 84276, 84281, 84286, 
    85011, 92513, 92545, 92546, 92547, 
    92544, 92548, 84272, 84274, 84046, 
    84049, 92541, 91372, 91374
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00088

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 (92511,92518,84047,84277,84282,92514,92549,85010,92542,92543,84273,84275,84955,84276,84281,84286,85011,92513,92545,92546,92547,92544,92548,84272,84274,84046,84049,92541,91372,91374)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
84046 nuie Belfast Sink 595 x 455 x 254mm - White
84047 nuie Belfast Sink 795 x 460 x 245mm - White
84049 nuie Belfast Sink 460 x 380 x 205mm - White
84272 nuie Butler Sink 595 x 450 x 220mm - White
84273 nuie Butler Sink 795 x 500 x 220mm - White
84274 nuie Butler Sink comes with Overflow 595 x 450 x 220mm - White
84275 nuie Butler Sink comes with Overflow 795 x 500 x 220mm - White
84276 nuie Butler Sink comes with Tap Ledge 595 x 450 x 220mm - White
84277 nuie Butler Sink comes with Tap Ledge 795 x 500 x 220mm - White
84281 nuie Butler Sink comes with Overflow and Tap Ledge 595 x 450 x 220mm - White
84282 nuie Butler Sink comes with Overflow and Tap Ledge 795 x 500 x 220mm - White
84286 nuie Butler Sink comes with Overflow and Tap Ledge 595 x 450 x 220mm - White
84955 nuie Fireclay Sinks Fireclay Cleaner Sink with Grid 455mm x 362mm x 396mm - White
85010 nuie Counter Top Sink 1.5 Bowl 1010 x 525mm - White
85011 nuie Counter Top Sink Single Bowl 1010 x 525mm - White
91372 nuie Kitchen Taps Ravi Mono Basin Single Lever Round Basin Tap & Rinser - Brushed Nickel
91374 nuie Kitchen Taps Ravi Mono Basin Single Lever Round Basin Tap & Rinser - Brushed Brass
92511 nuie Butler Sink 595mm x 450mm x 220mm - Black
92513 nuie Butler Sink Fluted with Overflow 595mm x 450mm x 220mm - White
92514 nuie Butler Sink Fluted with Overflow 795mm x 500mm x 220mm - White
92518 nuie Counter Top Sink Single Bowl 1010mm x 525mm - White
92541 nuie Inset Single Bowl with Overflow 457mm x 457mm x 203mm - White
92542 nuie Inset Single Bowl with Overflow 711mm x 483mm x 254mm - White
92543 nuie Inset Single Bowl with Overflow 762mm x 457mm x 254mm - White
92544 nuie Inset Single Bowl with Overflow & Central Waste 548mm x 442mm x 197mm - White
92545 nuie Inset Sink Central Waste 1.5 Bowl 549mm x 441mm x 195mm LH - White
92546 nuie Inset Sink Central Waste 1.5 Bowl 549mm x 441mm x 195mm RH - White
92547 nuie Inset Round Single Bowl with Overflow & Central Waste 460mm x 191mm - White
92548 nuie Inset Single Bowl with Overflow 457mm x 457mm x 203mm - Black
92549 nuie Inset Single Bowl with Overflow 548mm x 442mm x 197mm - Black