Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcccfdae2a1fa11f785307c9d61c32f6bfa81e17e4dabf40b81f4025401fa9f4' 
  AND token = 'n2JLV/ARoAImvWOajxqpIeKxJGx+zURAvYiedJAWXeA=' 
  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"
    }
  }
}