Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d80a130e0cd83bbc864be3825dfa594dd839d3eac5a80b786e29265a3198cf1' 
  AND token = '6xNmFSY/JGcgOrznn8+cHuCOeEkUbzHZ6YDQPj8d+98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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