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, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (6943) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.00"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "const",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "ref": [
        "const",
        "const"
      ],
      "rows_examined_per_scan": 1,
      "rows_produced_per_join": 1,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "0.00",
        "eval_cost": "0.10",
        "prefix_cost": "0.00",
        "data_read_per_join": "4K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text",
        "unit_name"
      ]
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
6943 Vulkan L15/2 LabLine Nitrogen Line Pressure Reducer 0-1.5 bar, fully chrome-plated, with metal diaphragm for gas purity 5.0<br />Standards & Design:<br /><br />two-stage design, with safety gauges according to DIN EN ISO 5171, maximum inlet pressure: 20 bar, adjustable outlet pressure: 0-1<br /><br />Technical data:<br /><br />• maximum inlet pressure: 20 bar, adjustable outlet pressure: 0-1<br />• outlet pressure: 0-1<br />• output: 8 Nm³/h air at 1<br />• Inlet: 8 mm stainless steel compression fitting, Outlet: 8 mm stainless steel compression fitting, input pressure gauge: 0-40/20 bar, output pressure gauge: 0-2<br />• Outlet: 8 mm stainless steel compression fitting, input pressure gauge: 0-40/20 bar, output pressure gauge: 0-2<br /><br />Dimensions:<br /><br />width x height x depth: 240 x 190 x 75 mm