SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ff1f877b8ddc60a8a0824bb59d2d32b9cc7d679786081e65cb91a975009ba0' 
  AND token = 'BOYjeA2kh+CVYPvBqxA6jWpIkCyYmr7OcVczTWps5FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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