Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d405b0d4b9e8deadc2436fea9adf80f0d67cde1908f99e284890772353c78db' 
  AND token = 'cJUXpUtrCvj7NTzj9/WEei1Y2OECQ+qYNqTtljZQHGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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