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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613c7dbb3d43a733144ead14ddc7deca8b8a43bf6ed503c4587d55ea6fddc81b' 
  AND token = 'JKuckU3Ho4j5oIc1jYbJ8xGJ4O11N8FzmdMMdp7fNZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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