SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '11a2fc17f98a482f1deabfa5b064ee65a99c4ce969b4a535ab8e488279988370' 
  AND token = '4GUMBqWumRPmSomDoC0Bh5yiJUVfpXLK1dRdcIQspHI=' 
  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"
    }
  }
}