Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c2f5a82f6a67ab3c7137309bccb58abcbb8c6e896e3c6b09f19b931497b520' 
  AND token = 'KKhl0jTP9rkt+8b+cFZMOVjpKeazlY/Ib3Y1058Phwg=' 
  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"
    }
  }
}