Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b789b964eef01e3f95f9bb89fabccd929bcc10b493af92c54872a4904e2ee97a' 
  AND token = 'dxhPVk5ApTV5f3aJCl/EWdUX8YaU19l7QmPd+D4UECU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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