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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ae35979a7d030bf7fc24aac201291bf3dd7a7e76488a5a10c8ecd646e101157e' 
  AND token = '9Li91Jlfp7Qk80JLYFSKO9Czi9vE5rdEmrhqx5rAGFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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