Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9902d68fdab0dfa8a338d8847056e4e0ec9b38eea786e525d56f2fd65b04b8e3' 
  AND token = 'lU6aKUTg99eU9+b/UTCSAlJYDa7N73JEUjgZa7DRQEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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