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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadb5e842049b0129458dafcd274b872eec20b8921035d211d029ae7887cdf04' 
  AND token = '6C58XkTS7av9+1cDJHa0IIXqpxUkZeC+mm5+sKun0is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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