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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a0d943960c8d51c0abab7851d7b7a5320733f2a8e047a987b5e36bc87eaca4cf' 
  AND token = '+JuJSZz9HJJ8aMiqlIh6NZARdBzfwgnv5c+iq2cL2eU=' 
  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"
    }
  }
}