Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa8c9fc436607dca79e0d797e9002b0de5d4ae39d3108d52b2e0f5a6f07da50' 
  AND token = 'G1m0uiVB5UAr3KXU0ELPcH0WIhM8A1qPKKzHo48NStM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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