Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6322b7cee343b5156800d07ad134e91f5435ce748cde2b1d20a81f34ba83a6' 
  AND token = 'c3iAUR3ODTwIyLK1gnluB4VPRzN7ue0PzuE8T7HJPag=' 
  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"
    }
  }
}