Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44a8260cc83d7ec03e46d80b8c91f5f0b3b31b0fbd89d9b9c56246badb8804d' 
  AND token = 'NAfIGVc1f8Fd3uBkS6I3XKk9lUYDpb92Ygqw+cO1MHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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