SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '629671a52dfbf623258c222680f6f63d7dcfd4ea76d01515b45f584356f36fdc' 
  AND token = 'kzRzxvMYbzXcc/zXQDlUah+G3hnHZUzhEjN8+BywnMM=' 
  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"
    }
  }
}