Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0d5925c9b6324405cabe22211b276cf325601b824c7a9942de8dd57454a121' 
  AND token = 'UhXAEtksV81TPxd4ujWEidrphBlzPMkTRRd1DPtx2eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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