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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5966c1dcc48512432f58cb9687b165ba88721e8fea9ffd95d138903e0ff9960d' 
  AND token = 'LnoFed/i7PO1eI+JZMkwTFQ+GnKkSDTxwAdgHCLnmDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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