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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efd16dac40761bef9f5b7ab77ade6eab2d86759cbb62c5001b1509c028ed64a' 
  AND token = '4UcWvM0f/o9XhZa3y36ug7t7X+G0SVqBF8/CvdsbsMU=' 
  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"
    }
  }
}