Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d31589c649224f1df72dce0420858aa3f06eb7e2fc74fc8f8a6f5ce9ba6307' 
  AND token = 'NQMqkTUeVap64ze36DPLnpPxb41jtrLaYMVZB63prGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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