Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ccf2d69b1adbd2c7d21c4484992557af65162a42c08ca559c89f9464e41a65' 
  AND token = 'Uzz90XQ+M42OKGgBaqwSIhQ17LDEwc0yda3rGCB9VR4=' 
  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"
    }
  }
}