Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bdcdfca1d123ced1f746a9c31841d493ababce21f4b64f94e4a4f486b2409f' 
  AND token = '83rzJ8QJVBXBPHcqi7O/Jios+/wU9srVVVGzKcr7iOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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