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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5d308bb0daef73ec2a4be3c8e20ca5fd44a77c803659aad7adf7a7f6c747b231' 
  AND token = '04kZEeX1ZV4QkwTHXeP2pEmE2+l6XUT3y5EIyaTUyfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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