SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec6315ecceb9ceb63a81cb56784c9dd598d08eb4780321113fd72f4396e5424' 
  AND token = '11h0sXyOpAQ+kMLaJCGFz/QmqsEF9MpwvzfZEolEy7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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