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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7641078eb04bb7d48c0e5347a56958cc04b3f5a8fb08684de3454da81c7161dc' 
  AND token = '/NpelSB8xvnpsRXARRMYh6hNlvkwB+02vnwtEj42pS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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