Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba508578f6be7bab9ea51a995f947c9ad72f633a974f69fa63fbf247686b04d2' 
  AND token = 'y9uHYAez8OrS57vSMea99Cbd7PcueYbpH6Uw8vldcS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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