Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e93396d9a3b523a1ce86c234a38b65220a747c7d264c246d2ab9312ba439986' 
  AND token = '4e1IgWoovZQ9nguVquhQo2sl8O7+CRnyrMmrYDdZZG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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