SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '49f723bde9a51aa81579210127768a15cd7ab0209f53336064421b806df34da2' 
  AND token = 'RqZS95XLaPo1Vdgriw4CGOiRHGTdSLOfj6Iz1H1f+BU=' 
  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"
    }
  }
}