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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd573a2aff049e0d98829846b3356c4e6739c3f75b323b74d23fde99fe3999f13' 
  AND token = 'vNlyjn1FREuPe94Q29H4kQK5Ep1B1kZjh+DcfBxOnKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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