Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda98dced54a99652d859295b1554a088bceac213cfe9289f231531a5062f607' 
  AND token = 'ZK7m97p4g/JQFMtIPwe3gEzqi1i76dbrVQxb9uDygcQ=' 
  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"
    }
  }
}