SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673fea809d3355ef10941b5777d0c788616f08e5a56b613cfc7b888420024841' 
  AND token = 'qxzpgQC7JhbV46rPzewmCdj3dBXxquwcZ4Wk994FqxM=' 
  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"
    }
  }
}