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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fa55490087f40b4de9e9abc587938d1ae16726ea6b68d4f0ed30de59af9c61' 
  AND token = 'tOdKJQTMy7usFwAXVPGQ0nAg9nk0lS+neWcPPMotGc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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