SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '468ad0ee857c3dcd1276b537816b4320d17be2959b3a6bd4d89eb5f9ff44c516' 
  AND token = 'g1Bbu7dV6ZdGwq/47gG9f4XQlHh9Ih2L2rTg+kPvdbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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