Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909cc87a64cd949fafe0e6883bc368d6a4f58a9d0440b8f3ea8692a32a4b2d28' 
  AND token = 'TBkBVVCIs5gDwOi5KXr5La1Jr0RCn5O1gNXCigixScg=' 
  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"
    }
  }
}