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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cbf198ea76f8b7aea4594cf290d974643178c8cacf6f55e63b93e9c03548433' 
  AND token = 'mm8RocXGNaUaStGS9Ld5uO09N+04Y2JBDzNyUTnSOz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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