Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc786e8e07b568f9d44b232c619798934ebe42c466001ee3db1ae22fb7febf8' 
  AND token = 'YDtlU2WDwjiGWOc/WgVm9t3msLyImoshCjy44RtAQME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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