SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'bcd9e9b21d22e01284def972afe67655466ffd38472fb586b6551d8c1bf8a7fc' 
  AND token = 'C2nQHyV2mZPKUwbeBnFcXFpZ5Wkjj9Mr0PGdSK4oMMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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