SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '46f0d0b24f1609a65b1822cf33a5547efd175e75767cd4f434bf58b327d9ca8d' 
  AND token = 'CglE4Ye3PfqaWt9D62tYSyE+/HhzLLC6Qy7DEsCJzlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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