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SELECT 
  pd.product_id as product_id, 
  pd.product as product 
FROM 
  cscart_product_descriptions pd 
WHERE 
  1 
  AND pd.product_id = 2010 
  AND pd.lang_code = 'en'

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}