Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847d6ae63bd495f22e040fa73a6224473fb03acb49fef270c64c39c6d1b46208' 
  AND token = 'vvcRJitMPaXeSUBZ2IbprESfK84uk8qHnB7k+kkt6gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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