Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08bf0633b6eef06f1ece5dc980f1b953e86716e735f6e2ea2d45a9d3e016243' 
  AND token = '9XkEGsKU9JzvZ7OVoYNNt3KfXdXcg7YJzxjFgZRe1NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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