SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1df67b528a1ec1f9451d2171e19fe69668baa09759d0f6c6b4d5cfee32f28c0' 
  AND token = 'FyE74Z+rUZZ6VIRd/GNL+qKo8UKmMEKe28HpQUzlqjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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