Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97f98a97167b44a5cb2b161ab9ce2eff6ee9c25fe2e8a3944c453261bf9b0dc' 
  AND token = '5wjGkX9BG6rQxalyDxaJhOQ8rZ/0h6PlEL7LM4Dhfcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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