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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e4a25f52512a0978b747e178d293292fc9b24d93508f0117d5d01c7d236ce49d' 
  AND token = 'etQEqxUJh9lL6ddtu7FLFdT9FbP7WdsK3HE+zlPM9no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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