SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80b860cbe6bcaebf09cba784d67c13d62f5f1a3c26a8eb3e4de34d7599af2b4' 
  AND token = 'gNKQcnyKlsZNJqf86CxcVA9xThbKvPHBDAv2G5UuLII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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