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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '957468da30c8ddde9daa56615d5e8d6703cdc29c11d54397f6309433790a1cb5' 
  AND token = 'nUE6H05dTSQzZKv9Xfpeu25XVyrsn7iwyDM1eWXUA50=' 
  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"
    }
  }
}