SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f09393b1b8249639b381659bae75ef334a2964455bc8a85ec073ed46d7b5b2' 
  AND token = 'wiJo0X5xlmBTuZJ6/U/F8EqBaq7klRIG0IY4L128gWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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