Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c535316f69dcd474c39071635d7a5f23397124b4151feb32ee61fb94b4590c7c' 
  AND token = 'sSzdEO+nZ9SrwOMX4vutPHonOX7COJEptimKzvA/eoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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