Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99c734b148de4ed6fe9c78554707eed1efb7ec74e547f49b8027c1ca8ced073' 
  AND token = 'N50swlutD55hxgp/8rKehhI5ltrMW5GLAF2A8p22zug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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