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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd66bb6c773137651c9e15cc10b34c6c10bc1db2f5520436171b26205c368109d' 
  AND token = '8mWDhCjNvf50UXqqnqw0xWqP5y8XxmbP7/Gl3WfNsog=' 
  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"
    }
  }
}