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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa4cf1e6f704c00a641fa772fa8a1f2bde7974cfecd27a277a0ecefec774d9e' 
  AND token = 'GcU5ovB/OT1ZXilN+uO3+EHvkqSh7CQSyMVM/DRa1YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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