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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439c62aab57a5fc8e473b8e93ccbe9bbd3643e08497363fc5cbcb1a386d57027' 
  AND token = 'ucPB3eShTLjYr4Yf1WIc6AN2yQWbWib5sZ5FGubc7Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}