SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201894174ddc3bc66544a3c8efc186801baca64ab80315b174231b198fd68b6e' 
  AND token = 'Zzkma3ehhvMVrBTPVcz1JMxy9FXpxSLLl+9wQnlXgxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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