SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83728f3a739f074c5a4936ae36be8ec56a7e3c8bc340254d95e95b43a2c600f1' 
  AND token = 'PIJCGEuTy1lFpa9JQjhzV7xHmLaQ+aBHACnZNChXGGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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