Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb3d157e74d159389c698704bed420c0597a2bbc40127065e1afe43afe45ae0' 
  AND token = '2MNVRzw9CncNXK1xgA04pCMuNjUKi1JLCQHgphehz2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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