SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b94381bec7a9adf5c239e38d8f9a8c6a030e6cf7d778afc32f560d4e85f86636' 
  AND token = '0isvOoKIOV4tjtLH8+ZOIzNZ2BsvgTQcGjdwiLGh/cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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