Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84042ec0320982464f04938c775a31ec96b227d1e85f6a48edbc865225ee204' 
  AND token = 'rIt3Xamx9QlgF0x4wCLrOiLbgjn+3pIwwtVWce6VGSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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