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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13859a98a5f02ce1e3fccd251b215a18d41c70355ad2c0cfa4aa51c6614c33a3' 
  AND token = 'D8pjXARxNGgIe1F0EyQ1sfLkh3NpQWG25A9lXSmQK0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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