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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd997a41d8b8ea0718e1b4dbd945175d9144150487772fedb7fa0d8b4e371adbb' 
  AND token = '9gavcxo36MNWCnq9qDJE/mRx5hPLyHfOf8RmjizX4Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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