Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a1ebf3ae911aa33df3ab74001116194dca69ab571431180b764f5a1734565a' 
  AND token = '+735zsmrUTuZDsIx3hqcYswci1lrJvNQAibVbEBguew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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