Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b0f56d7733707d2e18be130a15dafb755d1ee9f3baff0803105b299ebe18a2' 
  AND token = 'jQtbTZjp9//3QpeFLjR7hFpsoS29Y/ug2zj7hS5MoiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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