Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99ea1daa288c630768d8e70e6c8e007fa34644b9f942f8d896fb93456c13153' 
  AND token = 'pItpBviNjB81it8eXDWUsrfvkN/yc+Q/XGgaADJq+lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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