Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42eb121007839e9feca40e70cfa1039f00c420f75984fbc80c9c84d3639762bf' 
  AND token = 'cf+rfgcOdYtIRSgTMiwF/N1t+wHqFMhgzR+1EDFc3ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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