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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e40f369169c2926d4c14d300ed431f75bed41e1ce85baa1d0968cfd50e31f3' 
  AND token = 'PSRqYl9lXcvVqkRxlYulQjebeT+PJ9DzoUJOXsw8CTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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