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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '596e7c3c1c3c863caa9e5dfa9cbfc9fe386557e4eda732eb247bfae95e0ee5e9' 
  AND token = 'a8eMbjYm1Wt2IEvhDlZSYlka2OZu6RqtydlA18JfAWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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