SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dac2d934248d17ee2eed06737b4f7b3c5cb57e6d2386944afb1147d216ffadd9' 
  AND token = 'E+PTZHjy/F1bSMlsCv2CmPYm7Ltw4f5Xr6zcmFyWtuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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