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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9114a2de40767dd17813ae08ae1ddeb461223e36b1fb23a6e095a9df639327' 
  AND token = '296OV+Y8noRHmXomIzVjrZjAzjrQkzj0uhMNucO9JTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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