SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e51ccfa3c891b5efb83d837a5a143501849158b64d99ced4333dc99724712128' 
  AND token = '7AWQCu/qwNBy88lLl7KkdfyRiu/GvVNJzoE6g6c8T8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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