SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a761704d4ba99e3701fb629f62501d511c00948b05f807acee67369a8755c921' 
  AND token = 'k8QiojtM6fk+6W/zz6pHqIDy5X2m/vXYFFCGw5LrUHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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