SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9b82eb426ecde0d4e1fd0484d6da6c6399ab52b5576c0482f38b1439fe3432f9' 
  AND token = 'm3YEOUO2wT+bViyQGLYk5CVXCruo1PyRNBGsZjDfFWs=' 
  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"
    }
  }
}