SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791d4f84f7ee95ac3421af7d67669c161dd724532135d93f6ba608f977431233' 
  AND token = 'yhynpqY/t9qJlBO5NSYzbxpy2mn4kl5Qz+v5f5FswkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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