Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cafe71e35361624bb1dd24ebe6c52c75588fd6dcbe36def17a538bcaade58a1' 
  AND token = 'jQwOlyEkWqjXnFxLXB/i+2QoPmxu4kaNf/S3F5ubi3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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