Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0eb66a0765366a84b0ef08ed07b215c7e5c9964d24d4f3b12af160c504b2156' 
  AND token = 'T7k3f33sf/NTi0sBdoh5D/b6Rx/9xqpfrIq8k8aWGyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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