SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2738181d256f116ddd683889a093adf12c8982e93e301b31f439fd64948033b5' 
  AND token = 'VnmnG7zSpH3MWQ/KiosgOfXd+lKu/9kOYNUubBQjc8o=' 
  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"
    }
  }
}