Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d8529a2706dd0127fdf9d74655a471279634103e65e777bd29e4fa1e23cc1a' 
  AND token = '/tHXERNOFgsCf3svVaCzQQhVE77obkKtum19kq5qH8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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