Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb254f36e74a5e4c7af7f2cadd37fd1caf82c43f12c233090bbd1e1968249ef4' 
  AND token = 'xgJpYjmQcx2tkcLDe0YxMhCm58jVFAXEFL7edPlrwo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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