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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40620a673cfec6b9c40e87454ac5da3a9a3cf97841bab5b9198d00310cf39fbe' 
  AND token = 'fwcXYL+7p35xzCDnGt9694IJ5O5LnJwWRV8J4kAgQtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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