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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca66299238a2e1d225cd931583c07c0dc87593ad67c1a0f6923bdc3456910782' 
  AND token = 'vlw+jhdAoqsutIbU7CS2kP+AG2sB2pPaiZHUC4fxBWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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