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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '39c141d234490c74c4c13540019f613c240b7f024fc32a63667f57084cfa363b' 
  AND token = 'rATwExy6NSu7ru3ZyfOWVnYjvKexq9t+sOqi8BoyppA=' 
  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"
    }
  }
}