Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fe0939400ada9cad0f7f70c733845ca7b7354c6a7a3c9906048dd4c74a11d9' 
  AND token = 'oz1gTqijqsJIiRN7duibRkYV7MFSd2pxGuux9hqYrrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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